A slang term to describe Microsoft's true/false/error scheme used in many places in the Win32 API. It's used to describe when something has 3 states, as compared to Boolean, which has two states (usually true or false).
The GetMessage API is an interesting example of the bizarre Microsoft Troolean (as opposed to traditional, Boolean) logic. GetMessage is defined to return a BOOL, but the documentation specifies three types of returns, non-zero, zero and -1. I am not making it up! Here's an excerpt from the help file:
* If the function retrieves a message other than WM_QUIT, the return value is nonzero.
* If the function retrieves the WM_QUIT message, the return value is zero.
Archaic american form of 'goodbye'. It derives from the french expression "a tout a l'heure" meaning "see you later", and came into vogue in the US particularly after the second world war.